The monthly Critical Mass Bicycle event takes place on the last Friday of each month. September's event will be the 28th. Participants begin forming each month at Justin Hermann Plaza at the foot of Market Street at about 6:00 P.M. Because of the large number of bicyclists, traffic, particularly in the downtown area, will be impacted, and motorists are alerted to possible driving delays.
For more information, please contact:
Public Affairs Office
850 Bryant Street, Room 549, San Francisco, CA. 94103